...there are a few things that stand out.

First off, I think I'll have to retract my hypothesis that we're all core characters, some turned, as Yuna tells us she isn't a Scooby. Her character is male, short, dark, childish (with the added "bitca" which she admits she just added for $#it and giggles) and appears first in the second season. She could still be some minor character that's basically good (the principal, one of the students).

The second thing that still stands out is that out of six characters, Taiga is still the only non-human.
Of course, this does not mean the other five are telling the truth: the added info by Isaac and most notably FT (who decided not to answer his assigned question, but picked this one instead) may be a setup to make sure that Taiga is standing out.
Still, this does not change the fact that Taiga is the only one, in a series that's based on the premise of killing Vampires, Demons and other monsters.

Both Ranagrande and Taiga refuse to answer the question which season they started in. They both claim that this would constitute a character claim, for which they are not ready.

The question remains: where do we go from here? The more we know, the more we might be setting up our own loss because the scum will know better who to target. At this point, I'm not willing to keep on asking more information from everybody, until we get some more solid information (i.e.: Night actions).